Break or cut 2 large ripe bananas into 1-inch pieces. Add the banana pieces to the bowl of a food processor with 2 Tablespoons cocoa powder and 2 Tablespoons creamy peanut butter. Process for about 20 seconds, then scrape down the sides of the bowl. Process again until the mixture is completely smooth. Divide into two to four bowls and serve immediately. Store leftovers in an airtight container in the fridge for up to two days.